A car key fob is a small remote control. It helps you lock and unlock your car doors. This small device needs a battery to work. But what size battery does a car key fob use? This article will explain everything. You will learn how to find the right battery size for your key fob.
What is a Car Key Fob?
A car key fob is a remote control for your car. It lets you open or close your car without a key. Some key fobs also start the car engine. They are easy to carry in your pocket or bag. Inside the fob, there is a small battery. This battery gives power to the device.
Why is Battery Size Important?
The battery size is important. If you use the wrong size, the fob will not work. A battery too big will not fit inside the fob. A battery too small will move inside the fob and stop working. Also, the battery must give the right power. Otherwise, your car key fob will fail to work well.
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Common Car Key Fob Battery Sizes
Most car key fobs use small button batteries. These are also called coin batteries. The most common sizes are CR2032, CR2025, and CR2016. These numbers tell the size and type of the battery.
| Battery Size | Diameter (mm) | Thickness (mm) | Voltage (Volts) | Common Use |
|---|---|---|---|---|
| CR2032 | 20 | 3.2 | 3 | Car key fobs, watches, calculators |
| CR2025 | 20 | 2.5 | 3 | Car key fobs, fitness devices |
| CR2016 | 20 | 1.6 | 3 | Car key fobs, small remotes |
How to Find Your Car Key Fob Battery Size
Finding the battery size is easy. Follow these steps:
- Open your car key fob carefully. Use a small screwdriver or coin.
- Look inside the fob. You will see a small round battery.
- Check the battery for numbers. The battery size is usually written on it.
- Write down the battery size or take a photo.
- Buy a new battery with the same size and voltage.
If you cannot open the fob, check your car manual. It often tells the battery size. You can also look online. Search for your car brand and model with “key fob battery size.”
Why Do Different Cars Use Different Battery Sizes?
Not all car key fobs are the same. Different car makers use different batteries. This depends on the fob design and power needs. Some cars need stronger batteries. Others use smaller ones to save space. That is why it is important to find the exact size your car needs.
Signs You Need to Replace Your Key Fob Battery
How do you know when to change the battery? Here are some signs:
- Your car does not respond to the key fob.
- The key fob works only close to the car.
- The buttons on the fob need more presses.
- The LED light on the fob is dim or off.
If you see these signs, your battery is low. It is time to replace it.
Where to Buy Car Key Fob Batteries
You can buy batteries at many places:
- Local stores like Walmart or AutoZone.
- Online shops like Amazon or eBay.
- Battery specialty shops.
- Car dealer service centers.
When buying, check the battery model carefully. Also, check the voltage. Do not buy cheaper batteries that do not fit or last long.
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How to Replace the Battery in Your Car Key Fob
Replacing the battery is easy. Follow these steps:
- Open the key fob using a small tool.
- Remove the old battery carefully.
- Put the new battery in the same place.
- Make sure the battery is placed with the right side up. Usually, the “+” side faces up.
- Close the key fob securely.
- Test the fob to check if it works.
If the fob does not work, check the battery position. Try again carefully.
Tips for Taking Care of Your Key Fob Battery
To make your battery last longer, follow these tips:
- Keep your key fob dry and clean.
- Do not drop or hit the fob hard.
- Remove the battery if you will not use the fob for a long time.
- Replace the battery once a year or when needed.
Summary Table of Key Points
| Topic | Key Facts |
|---|---|
| Common battery sizes | CR2032, CR2025, CR2016 |
| Battery voltage | 3 Volts |
| How to find size | Look inside fob or check manual |
| Where to buy | Stores, online shops, dealers |
| Signs to replace | Weak signal, no response, dim light |
Frequently Asked Questions
What Size Battery Is In A Car Key Fob?
Most car key fobs use a CR2032 3-volt lithium coin battery. Some models may require CR2025 or CR1632 types. Check your fob for exact size.
Can You Use A Cr2032 Instead Of Cr2016 For Key Fob?
You should not use a CR2032 instead of a CR2016 for your key fob. The CR2032 is thicker and may not fit properly. Always use the battery size specified by your key fob manufacturer to ensure proper function and avoid damage.
Are Car Key Fob Batteries All The Same?
Car key fob batteries vary by model and brand. Check your key fob or manual for the exact battery size needed.
How Do I Know What Key Fob Battery I Need?
Check the battery size stamped inside your key fob or consult your car’s manual. Most use CR2032 or CR2025 batteries.
Conclusion
The car key fob battery size is a small but important detail. Using the right battery keeps your fob working well. Most fobs use button batteries like CR2032 or CR2025. You can find the battery size by opening the fob or reading the manual. Replace the battery when the fob shows signs of low power. Buy good quality batteries from trusted sellers. Take care of your key fob to make the battery last longer.
Now you know how to find and replace your car key fob battery size. This helps keep your car safe and easy to use every day.
